A fuckin' weasel. You know the kind. That prick that always ends up ruining your day. That dude that steals your chick. In short, a complete asshole, one that shits all over everything he/she comes near - (team america reference right there). This person is an operator, they appear indecisive and cool at first, however they usually have a behind the scenes motive to fuck your life up.
Brock is such a weasel fuck, he screwed my girl then told my boss I'm a crack addict!!
Someone who kisses ass and will always do whatever takes the least effort. Any time a friendship requires effort on Weaselfuck's part, they will avoid contact with the other person and hide with their parents where they feel safe.
Weaselfuck's parents are so naive and trusting that I lost weaselfuck as a friend when another asshole lied to them about me.